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首页> 外文期刊>Environmental Monitoring and Assessment >Metal release from serpentine soils in Sri Lanka
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Metal release from serpentine soils in Sri Lanka

机译：斯里兰卡蛇形土壤中的金属释放

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Ultramafic rocks and their related soils (i.e., serpentine soils) are non-anthropogenic sources of metal contamination. Elevated concentrations of metals re-leased from these soils into the surrounding areas and groundwater have ecological-, agricultural-, and human health-related consequences. Here we report the geo-chemistry of four different serpentine soil localities in Sri Lanka by coupling interpretations garnered from physicochemical properties and chemical extractions. Both Ni and Mn demonstrate appreciable release in water from the Ussangoda soils compared to the other three localities, with Ni and Mn metal release increasing with increasing ionic strengths at all sites. Sequential extraction experiments, utilized to identify 'elemental pools,' indicate that Mn is mainly associated with oxides/(oxy)hydroxides, whereas Ni and Cr are bound in silicates and spinels. Nickel was the most bioavailable metal compared to Mn and Cr in all four soils, with the highest value observed in the Ussangoda soil at 168± 6.40 mg kg~(-1) via the 0.01-M CaCl_2 extraction. Although Mn is dominantly bound in oxides/(oxy)hydroxides, Mn is widely dispersed with concen-trations reaching as high as 391 mg kg~(-1) (Yudhaganawa) in the organic fraction and 49 mg kg~(-1) (Ussangoda) in the exchangeable fraction. Despite Cr being primarily retained in the residual fraction, the second largest pool of Cr was in the organic matter fraction (693 mg kg~(-1) in the Yudhaganawa soil). Overall, our results support that serpentine soils in Sri Lanka offer a highly labile source of metals to the critical zone.
机译：超镁铁质岩石及其相关土壤（即蛇形土壤）是非人为金属污染源。从这些土壤释放到周围区域和地下水中的金属浓度升高，会产生与生态，农业和人类健康相关的后果。在这里，我们通过结合从理化性质和化学提取中获得的解释，报告了斯里兰卡四个蛇形土壤不同地区的地球化学。与其他三个地点相比，镍和锰都表现出从Ussangoda土壤中大量释放，其中镍和锰金属的释放随着所有位置离子强度的增加而增加。用于鉴定“元素池”的顺序萃取实验表明，Mn主要与氧化物/（羟基）氢氧化物有关，而Ni和Cr则结合在硅酸盐和尖晶石中。在所有四种土壤中，镍都是比锰和铬生物利用度最高的金属，通过0.01-M CaCl_2萃取，在乌桑哥达土壤中观察到的最高值为168±6.40 mg kg〜（-1）。尽管Mn主要以氧化物/（羟基）氧化物的形式结合，但Mn的分散程度很高，其有机部分的浓度高达391 mg kg〜（-1）（Yudhaganawa），而49 mg kg〜（-1）（ Ussangoda）中的可交换部分。尽管Cr主要保留在残余部分中，但第二大Cr池仍在有机质部分（Yudhaganawa土壤中为693 mg kg〜（-1））。总体而言，我们的结果支持斯里兰卡的蛇形土壤为关键区域提供了高度不稳定的金属来源。

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